Charles



diritto iatea Letters Patent No. 108,770, dated November 1, 1870; antedated October 28, 1870.

IMPRQVEMENT in Locus The Schedule referred to in these Letters Patent and making part of the same.

. To all whom it may concern:

Be it known that I, CHARLES G. Drcnnnimx, of Boston` in the county of Suolk and State of Massachusetts, have invented certain Improvements in Locks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing making part-ot' this specification, in which- Figure 1 i s a .perspective view of the interior of the lock with the tulnblers and trunnion removed.

Figure 2 is 1t plan ofthe saine with the trunnio i in fplace.

Figure 3 is a plan representing the dog-tumbler, and \its relative position to the bolt when the latteris thrown in.

Figure -1 is also a plan, showing the interior of the lock, with the several tumblers and their auxiliaryl tumblers in place. Y

'Figure 5 is a section on the line a' a: of iig/4L Figure 6 is a plan of the front of the shell or casing.

Figure 7 is a longitudinal section through a'key of my improved construction.

Figure 8 is a perspective view of the trunnion detached.

Figure 9 is a perspective view ot one of the auxiliary tumblers.

My invention consists in coiibining and operating in a lock a stationary nupt-i'on, and a trunnipn, which tits over and pivots upon the same, with dog-tumbler, bolt, short stud and key, as herein described.

To enable others skilled in the art to understand and use my invention, I will proc'eed to describe the manner in whichl have carriedv it out.

In the said drawing- A is the shell or casing, the front portion a of which (iig. 6)`is made removable, and is provided with an aperture for the insertion ot' the key B, iig. 7, to bc de. scribed hereafter.

b is the rear portion of the shell or casing, from the inside of which, and made in the same piece therewith, projects 'a circular nuption or trunnionlguide; C, (see tig. 1,) which is slotted through its center for the passage oi'. and to guide the key.

Upon this nuptiou is placed the trunnion l), of. the form shown infigs. 2 and S, and also provided with a slot, c, for the entrance of the key.

d is the projecting arm of the trunnion, which comes in contact with and throwsvthe bolt out and in, to lock and unlock the door.

From the front side of vthe trunnion, and iliade in thc same piece therewith, projects a cam-shaped piece,

c. over which and a short stud, g, rising from the bolt 1*), is'littcd the first or dogtumbler G, of the form shown in tig. 3, suitable recesses, 10 11, being made in the tumbler to allow of its fitting into position.

When the bolt'is not thrown out, the upper edge 12 of the recess 10 rests upon the upper surfacel ofthe cam-shaped piece e, and the short stud g is within the portion of the recess 1l.

lhe second or middle tumbler H and the third tum bier I are made like each other, andare each provided with a slot, h, for the entrance of auxilary tumbler-s K L, presently to be explained.

Each of the three tun'iblers G H I is provided, at either its top or bottom, with a spring, It, one end of which bears either onthe upper or lower portion oi' the casing, by whiclreonstruction, when the wards of the key act or cease to act upon the tumblers H l, and the cam-shapedpiece c turns the dog-tumbler G, the several tumblers are free to move into the required positions to conform'to .the motion ofthe bolt, as itis thrown ont and in by the trunnion D.

Projecting ont from the inside of the bolt are four guide-pins, l, within which and resting upo'n a spring, m, are placed two auxiliary T-shaped tumblers, K L, both. oiwhicl .are provided with slots n, for the pass- Aage of a screw-pin, o, by which construction the'portion 1) of each ot'l the auxiliary tumbler-s is free to be moved up or down by and in the same directionas their respective tnmblers HI.

q is a thin plate interposed between the head ofthe screw-pin and upper auxiliarytumbler K, to relieve the friction which would otherwise arise from the sliding of the said auxiliary tumblers.

rlhc stem of the. key B is slot-ted out to admit o f the reception and adjustment ot a series of bits or wards therein.

lhese wards, when adjusted, are securely clamped by tightening a screw,'s, which longitudinally enters the slot from the lower end of the. stem.

,The construction above described admits of alarge number of changes, but before making a change thc bolt must be thrown in.

A lock made in accordance with my invention will befound to be more strong and durable than a lock in which the trnnnion bears and isl revolved within the sides of the shell or casing and furthenas my trunnion is entirely inclosed by and docs not project ontvside thereof, nojnstrument can be entered to turn it into a wrong position for entering the key..

Claim.

What I claim as my invention, and desire to secure byLctters Patent, isl The combination of the nuption O, trunnion D, dogtumbler G, bolt E,'short stud g, and key B, when constructed and operated substantially as and for the purpose described.

Witnesses: OHAS. G. DIGKERMAN.

N. W. STEARNS, l. E. TnsCHnMAoHER. 

